woods



(No Model.)

G. T. WOODS.

STEAM BOILER FURNACE.

Patented June 3, 1884 NITED STATES PATENT QFFICE.

GRANVILLE T. XVOODS, OF CINCINNATI, OHIO, ASSIGNOR TO EZRA W.

' VANDUZEN, OF SAME PLACE.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent'No. 299,894, dated June 3,1884.

Application filed J une 19, 1883. Renewed May 12, 1884. (No model.)

T at whom it may concern:

Be it known that I, GRANVILLE T. Woons,

a citizen of the United States, residing at Cincinnati, Ohio, haveinvented new and useful Improvements in Steam-Boiler Furnaces,

of which the following is a specification.

My invention relates to steam-boiler furnaces, and is designed toincrease their efiiciency by promoting combustion and economizing fuel;to which end it consists in the provision, construction, and arrangementof an auxiliary bridge-wall, in connection with a forced blast, as andfor the purposes hereinafter more fully set forth.

In the accompanying drawings, illustrating my invention, Figure 1 isavertical section of the furnace-setting of an ordinary flue-boiler,taken longitudinally through the fire-grate and rear combustion-chamber;Fig. 2, a front sectional elevation taken across the grate, and Fig. 3 apartial plan-section showing the relative arrangement of thebridge-walls.

A designates the boiler, B the grate, and O the ordinary bridge-wall,these parts being constructed and arranged in the ordinary man ner, andrequiring no special description, except as hereinafter indicated.

In rear of the bridge-wall C, I place an auxiliary bridge-wall, D,extending from about the level of the ash-pit to within, say, an inch orless of the boiler, around the lower exposed portion of its contour, andbetween the side walls of the furnace, and in rear of that a wall, G,forming the end wall of the ordinary filling constituting the bottom ofthe combustion-chamber. The three walls C, D, and G are constructed ofrefractory fire-brick.

Through the supplemental bridge-wall D, a little below the grate-level,are one or more horizontal apertures, E-usually three for a singleboiler-of sufficient size to permit the free passage of the gaseousproducts of combustion as impelled by blasts of air or steam from apipe, F, arranged before or in the 4 5 bridge-wall C, and havingsuitable nozzles projecting toward the axis of the apertures rearward.

The action of the apparatus is as follows: The pipe F being suppliedwith steam from the boiler, (as indicated by the dotted lines showing aconnection with the steam-dome,) or

through the apertures E and against the wall G, which action tends tothoroughly mingle the gases; and, moreover, by impelling them againstand between the walls C, D, and G,

which are highly heated, and at the same time withdrawing them fromcontact with the cooler surfaces of the'boiler, their temperature ishighly increased and kept above the point of thorough combustion. 7Furthermore, the partial vacuum being thus produced in the space forwardof the auxiliary bridge-wall D, a portion of the gases cooled by contactwith the boiler at the rear of the wall D are drawn forward-through thespace cl, between the said wall and the boiler, and carried downward andreheated and discharged again through the apertures E.

The most effective use of my invention is attained in connection withthe ordinary damper in the uptake of the boiler, by which a partialpressure may be maintained in the space at the rear of the auxiliarybridge-wall D, tending to promote the thorough combustion of the gaseswhile passing beneath the boiler and back through its flues, andmaintain thereby a higher temperature. The arrangement also tendsefficiently to prevent the formation of smoke.

I claim as my invention and desire to secure by Letters Patent 1. In asteam boiler furnace, a supple mental bridge-wall, D, in rear of theordinary bridge-wall, arranged with apertures Ebelow the grate-level,and a space, d, adjacent to the boiler, in combination with ablast-pipe, F, provided with nozzles arranged to discharge rearwardthrough the apertures E, substantially as and for the purpose specified.

2. In a steam-boiler furnace, the ordinary grate and bridge wall, thesupplementary extending backward from the top of said Wall,

2 v zeas s bridge-Wall 'D, having apertures, as described, I Intestimony whereof I have hereunto set and a space adjacent to theboiler, the Wall G my hand in the presence of two subscribing in rear ofwall D, and an inclined surface witnesses.

GRANVILLE T. WOODS. and a series of blast-pipes corresponding withXVitnesses:

the apertures in Wall D, all the elements in L. M. HOSEA,

combination, substantially as set forth. A. HAMILTON.

